Any idea what causes this sort of corruption in a RAW image off a GH2? It's not every image (maybe one in thirty) and the line isn't always in the same place. I only noticed these after they were copied onto an external hard drive (which I've since scanned for errors). The images were copied off a Transcend 32GB card via a Lightroom import using the inbuilt memory card reader on my laptop.

Options: - Memory card problem - Memory card copy problem - Memory card reader problem - Hard disk corruption

I'm currently in Peru and I don't have other cards and readers here to test :(

I've attached a resized JPG export of the problem, but I can post the RW2 file too if it's helpful